Object reference to class, newbie question.

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4.00/5 (1 vote)

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Hi,

So basically I've made a windows form I've put a text box on it and called it txtBox. I then have two classes within the namespace the form and the class I want to work on.

C#

namespace WCFWindowsF
{
    public class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            ClientPart wcfCall = new ClientPart();
        }
    }

    class ClientPart
    {
        static void Zain(string[] args)        
        {
            txtBox.Text = "WCF Simple Demo";
        }
    }
}

The error that occurs is 'The name 'txtBox' does not exist in the current context.' I just can't understand why since both classes are within the same namespace. Any help would be most appreciated. Thanks.

Posted 7-Dec-11 23:29pm

WurmInfinity

Updated 7-Dec-11 23:32pm

Eduard Lu

v2

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5 solutions

Solution 2

You need to inherit the source Class to get the textbox as shown below.

C#

namespace WCFWindowsF
{
    public class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
 
            ClientPart wcfCall = new ClientPart();
        }
    }
 
    class ClientPart : Form1
    {
        static void Zain(string[] args)        
        {
            txtBox.Text = "WCF Simple Demo";
        }
    }
}

Regards,
Eduard

Posted 7-Dec-11 23:45pm

Eduard Lu

Comments

WurmInfinity 8-Dec-11 5:49am

I see, thanks for the help but the problem is still persisting "Missing partial modifier on declaration of type 'WCFWindowsF.Form1'; another partial deceleration of this type exists.". I've read some stuff off google someone said make it 'public partial class Form1' but that didn't make a difference :(

Solution 3

Make the textBox public you can access it anywhere. OR inherit Form class in ClientPart class

Posted 7-Dec-11 23:49pm

koolprasad2003

Comments

WurmInfinity 8-Dec-11 5:53am

So I've added the inheritance but now I get the problem "Missing partial modifier on declaration of type 'WCFWindowsF.Form1'; another partial deceleration of this type exists."

Solution 4

As control of the form are by default private you cannot access it directly in another class.
you can use bellow method to access textbox in another class.

C#

namespace Test
{
    public partial class Form1 : Form
    {
        public string strTextBox
        {
            get { return txtBox.Text; }
            set { txtBox.Text = value; }
        }
        public Form1()
        {
            InitializeComponent();
            
            
        }

        public class ClientPart : Form1
        {
            static void Zain(string[] args)
            {

                Form1 objform = new Form1();
                objform.strTextBox = "WCF Simple Demo";
                
            }
        }
        
    }
    
    
}

Please mark as solution if its solved your problem

Posted 7-Dec-11 23:52pm

sagar15modi

Comments

WurmInfinity 8-Dec-11 5:57am

The partial component makes it inaccessible. When I remove the partial I get the error as mentioned above "Missing partial modifier on declaration of type 'WCFWindowsF.Form1'; another partial deceleration of this type exists.". :/

sagar15modi 8-Dec-11 7:13am

Partial means that your class was divided, so your Form class has more components than the one in your Form.cs file. VS just put the automatic generated code in one file and your code in another. So you can not eliminate the partial unless you move all the generated code into a single file, but if you do that and use the Form Designer to change a label font, then you are doom!

Solution 1

Since that you are using the same Namespace, make sure you are using an Access modifier Internal or Public in your Class

Take a look at this:
http://msdn.microsoft.com/en-us/library/ms173121.aspx[^]

Regards,
Eduard

Posted 7-Dec-11 23:32pm

Eduard Lu

Comments

WurmInfinity 8-Dec-11 5:36am

So I changed the 'ClientPart' class to public. It gave me access to the txtBox however now it says 'Missing partial modifier on declaration of type 'WCFWindowsF.Form1'; another partial deceleration of this type exists.

[no name] 8-Dec-11 5:46am

oh i see. will be posting a new solution for this :)

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WurmInfinity · Accepted Answer · 2011-12-08T00:41:00

Solution 5

I took a step back and realised what I was trying to do was basically like opening a door using a lemon. All I had to do was put my code in a button or another interactive object. My bad thanks for all the help guys :)

Posted 8-Dec-11 0:41am

WurmInfinity